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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfa64c758cca14bad83d7eece0b093d7d72ec7b94fdcc1613aad8e3f0aac492' 
  AND token = '8B0jNvQOjld56BFTePaQ36sFdX2sAmgS/OgyQ4UkhI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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