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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a92d2b9a8197998f7cd497fe02bc3618fadbcac05b02096035e6a220b1fa26' 
  AND token = 'LeW4eaCL4iri0K84hESShgCqlbC4zlGFS1tpAFAKc2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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