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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929a7d034dbe301b8e80942638ebffe4b221f9d38b4c477559cda8bc2b88b6f7' 
  AND token = 'G1mEFmTnQP6kH8ykTo1KekiTJmacmjCSfcyiBnba8PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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