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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373a973af84f95c769fc4a924a28ff748215a8f9f0cb98fb96342a72f625d84e' 
  AND token = '3kvnmcXRct47mW2Bi2kq8bvDnX1Sbt22sSgetpxvl+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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