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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093ac71ffc4ab4f804914f2faf5961603cd6b85316d52b409ee346b46de939eb' 
  AND token = 'K1HHrp0ffQ7xt+PjS63Z8JDBqxHBAg9SJinnQO8a2XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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