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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a0e9075cff23d63b23cbef04ec0c89429cc5963532b43337d3f9a7c701360e' 
  AND token = 'rXI5Xt0ufh3cRlCGB+IuOm3eRH1YOvIy31EQpVqJPfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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