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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35313eeadbe1d6de06cefa7170d4c99391768f032f11c45ba6d2e78e289f2298' 
  AND token = 'C0SUm4Sy9PHxXVKaC+TV5mNDfanpA/p3P2Cp7sx9EF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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