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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ccd83cd6d4432bac980ac3a164a72037f07a2f6349be3a5bb57ce4a0a1e055' 
  AND token = 'sq9cX5NufRFpVejgyslbi+bPZdJUX3ADJwi+20Vf8RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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