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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd92cd00e2ca8a0390f053dcd20b22b0d837b2e2bfbc8724e04e147cb20d736' 
  AND token = 'vRfLKSoPmZTDf1PXqKqg2rvq9aKB7sepQqSaBtPIEOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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