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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473efed3c55e67c1d96be9f78ef416631f5003c7b9161e4b9a8007327d5df95e' 
  AND token = 'TELRCT8EYJTLDlLYHfWOEEjmepH+Qaru98eBaHb/918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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