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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6745cc0b7dd4544dd7f085b1e9ac75c0a66745cf6237a6b9c975ceb8c90ce541' 
  AND token = 'sG1itvxHg3WiUp3O9+5C+9cbMCMFjbxY8JlPAgR2X/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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