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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c5ccf98402e388e7efe7bb7829456fff73c35ff371fc9bfeaaa7d04079e864' 
  AND token = '7/ec9mTygQKXpCxlkKl1eSe8N22dlF8l7/qf6YWoKNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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