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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895151eb3f6da4df7847e2cfb5be7aaa767a54a0103aa5a3cc1a63729d7c8f37' 
  AND token = '2x4oNmn0KHsMAtyiteFXqwavXURJ/lfKmAyWC9MI11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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