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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50abc65ada53828ca3eff2c82ea307fb1919e657de237372e150e241ce514e54' 
  AND token = 'dSfAnyuzxOAZiwaZnwJCO/rxi69zt1dLUKWwGaTLg7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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