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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f43cfc51a84190f4ab69c35cc789be57e47847b07f5c0b00ae2f15649919fc' 
  AND token = '/bw55Exi2STU9v17q96PYVhBJbvzm5IpXl+qBFB+4e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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