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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10eb696f94c25f444370858a6a908ee83275113f3414a88b10ab2c12ed756411' 
  AND token = 'gG5Vhwajr+uOUz2XE6MhPlIfLCdMW47HcL0DpF3OWkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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