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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1761e759bacd7d8bb5efd146c2da50003d4b6c8121ac3193a64d9cf68c6e8b1a' 
  AND token = 'DBwvcRSzfvK1ZvIbxn7ZvPsEO56IwOPLkfpmUUjgjEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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