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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a47128d935510e888f897c9ac2234433f2cb4061290f619aac53bd2fa37afd' 
  AND token = 's2s0Rdmk4PceL74p0hJLgCJ7OBoYNwy1XFnXOJRphaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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