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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533f9a470b94f4603a1fa688ae8aec0ddd8b3571e5c313d54a8e4caaef198b9a' 
  AND token = '74hXzwvjVelTobScBuSKkZw5MlbBRLXXl3jjsG1cjeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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