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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e57dfaea285412224d1f37e2b8cd94c5faae3c79e906fd9b4fbd88f20e58c4' 
  AND token = '/iCYl9mrYN+9r6tWeQb9NFvw9zrCuGP7eciNg2kjlyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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