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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa171dbfc55542b747ca1e43ed66b14f1fd213bbaa70fda2bdcdc11f5a454297' 
  AND token = '4cruIigsA3EmpPzp3kW6ohic0s0yah2MuF/oDx3ttDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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