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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c77d483d498f98b276a69185ee7ee2dd76c1b576b0cb63678f24bc300172a9' 
  AND token = '0SZC592gUBNfenTV9912kqKde6eJPURxmHMT3qM12k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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