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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b2dbc0c0f47b2a55231a5cdec2e8ded333808d3bdb25c7796c0310ab0a99bb' 
  AND token = 'F7Q8o8eHs7lqS6beW3AKdNpIlf6OtZzEZ5SaSVbjRoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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