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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4975218b52089e248dc06ff44aac6c9184fda240c162f295094cb769d9fd1ebb' 
  AND token = 'TU9+i/dPr5PN+mAEeu1Ef2xeNO8GlrC8QGsWPVnqo0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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