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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ec1ec75239f63b8fd4ad6d670d6114f078824fe1c31e4609dbc3289c80ced5' 
  AND token = 'hN8JYu971RkT+Egc1f2crt4YnfW/o0TKJdP/5C4M1yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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