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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02033f15191bd9a5819b8fbba9d5ec74fc92f505121afcea5664684d672dab97' 
  AND token = 'YFSNMJyEKd3FSmhIViVA8eg6piMF3pohHIXz3VJNwtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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