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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bc200da69eb724cf0f94aa813f4bf1b123e17379fc9b02c86163f9e1067640' 
  AND token = 'hJn7WAuBVJm6Vt3YD/qVXUggAndcHxhg60fURssam8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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