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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276f34ae38fea8bf76f8dfa356f065c0daf0809347578de1536f1936e1b1adc1' 
  AND token = 'HridZ8uuBa8vyTVKjk476ZsvD00/pRTEUjxVwOYEBhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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