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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e1e886988364c3e4a53df50f5abc45ee5bd53fc8dbefedbe1f2aeb597633ea' 
  AND token = 'if0I19ytZH/YkhCT5Bh7mxpm3nIYNmIMJxAxFrBo4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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