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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abc77e206670495339059cd7efc998df8f528a986985ed776be6f8e0fb901dd' 
  AND token = 'IQy5mtgfNbbmTQQ9t09Hl4HLzMP+38p3KByZn7QPFVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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