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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e796037d2f8f0953112ad3c523a50688b555f740e00f0153a550be6501d841' 
  AND token = 'B0blmgBDiQ8UtgkvvqCnb7CV+XQWKtCA6bx7XB+G2rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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