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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1339a7a2d43eb63b6941a3509cbdece079da73e7e0d898d5a02f3a6d8785d5ea' 
  AND token = 'AnlkfNc6dTXmYNDO12Ev8AWwbnTrmjjfus+PEw+QIjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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