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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4fb955b09f03e815af4cb2a4fa78fdfdfb3dc5f82ebe8afd6b7553fab569bb' 
  AND token = 'rIDOU3T0Wfc0ItBbk/ImvK+VLRK4oK6PSveY4DXbxUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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