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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62c93c4da94d9c4af11e301801493ce104cae50911410cafa23e74c74675e82' 
  AND token = '5cQgth6Zgz0rnBTGepQe20uXlftx8FB3jR1eft0xqRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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