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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2911b2374aa3bee0e7a2c42f0b9a5d5f27746443cee8439b181d0505a6701df3' 
  AND token = '6QdFOg6KgZUtCMcXCBWeIlDU+FNHTysQD81z+gcrCMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}