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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fc9980433c0606d810613b5d0c0cbce1affba0e24c48549762fca5afcc716d' 
  AND token = 'TS8ORDLVy6XIKlzli72o0BJLiKCkpgQw+n+LIy00WSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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