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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b5d1041c3616b6e7fa3be295b6ef8fc4116140e6ad92c76ec5bbcf41d4ec11' 
  AND token = 'qiTR3uGEzJYs6PuLEoHvqoz3Nj/T5eENUPaBdnxYVlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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