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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c219fc2d6ce3ca9770ae36732fad704b997c31765ed566dfef561f26868c46d8' 
  AND token = 'BKm8ZAlFBedQKkoqCV8NaJGB9GqIBTiTPimzyjfbJ9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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