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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ea74de95b46f7699478b8088ff7815e036189573796a44df329efd813fdbb7' 
  AND token = 'pbRgZGnnfmANdzr4I+/RqpDvpFXxrnx5JKW9iakprnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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