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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323515daddbd38ecd61f898b79d83e0a8a819f7daf809a0d88453a13ecbca67a' 
  AND token = 'RJSQN88WmwCgDkskXJhaf+ax7+I5r/RlXzb4j/dwU8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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