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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb07a9c933a309ad34f02428d400374dc32d423de509ebe5015418b02da2863e' 
  AND token = 'g9i0924jdZtonG4iDf7I6VBtEYcBQFgFIEEmoG+KBRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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