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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4441d1f64c9ecbd78014f862013c1c2b4c06b183684f68e70063872f4bf521e6' 
  AND token = 'rpGCJLpyfNp247ZkkpV+3WeQIonG97EL3QcfZfUCzgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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