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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6af7941c3ff1b74b1f35803179620c62e7ec97a55f41634750dfd48f04da245' 
  AND token = 'wJHHJcFiRqHpNuWnJpZcqDTZA1K0pI910KBmK9r8lgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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