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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9f9b884916218bf9bd67eeb62614f19c2eecad3fa84b6965d3d3646cc19d84' 
  AND token = '5SunrfUuk1dpVY9YB6Uc8hvZwxec6gWn6XO9c/2RDPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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