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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b5c9afa2ef6d0e12fcc6c9a79212f12790d20bb3f3c04913fa289f2c3e5545' 
  AND token = 'r9Lda3KHrQrwxXVzR798o/Hcoey6HllZeshhEV9mZn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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