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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4885a7d057956a2535c42ceae99364f95d1df2062128042ace33428528f3cee5' 
  AND token = 'mrOohUP1G3aKsJYisdh8KBjac5dVex3CumZ8ew2B/7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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