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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b4907d8bd924319a7613413f98449ed092518688f2b2de623ff3df6f75897' 
  AND token = 'UG3GSiPya8fEV7EXZ/8lRK1Rl+PSbEraMDBHs0J4dUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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